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Creating the Future with Connective Technologies

  

CCH – Frequently Asked Questions (FAQ)

  
Are CCH difficult to use in areas with a lot of branches?
A variety of methods are available for use in this situation, including the hanging method or the use of ropes or connection jigs, and using the bucket car to install from the side.
What should we do in the case of a bucket that only accommodates one person or a place that a bucket can’t reach?
Because the CCH are long, we provide jigs for attachment to electricity poles that allow them to be paid out from the ground.
Are there any points to be aware of to make installation more efficient?
Work can be conducted efficiently by exploiting the fact that both CCH and cables can be installed from the side. The possibility of side installation using the hanging method or the use of ropes is a distinctive feature of CCH, enabling work to be made more efficient.
Are there specific methods for efficient installation?
Work can be conducted efficiently by exploiting the fact that both CCH and cables can be installed from the side. The possibility of side installation using the hanging method or the use of ropes is a distinctive feature of CCH, enabling work to be made more efficient.
Are there methods enabling easy installation in areas with numerous roadside trees?
The hanging method employing a suspension jig can be used. The work can be completed by two people, with one person guiding the suspension jig, and the other simply install CCH from the side. When the suspension jig is unable to pass roadside trees, etc., moving the suspension jig forward enables efficient installation to be conducted while ensuring that the paid out CCH avoids the trees.
Are tools used for the connection units?
No tools are necessary. Simply make the two connections after securely pushing the CCH into the groove.
Can the connection units be reused?
No. In order to ensure strength and reliability, the connection units are completely fixed in place.
When cables are being passed through, does the shuttle ever fall?
Following the installation of the CCH, remove the shuttle by applying slight tension to the winding part and fixing the CCH in place. Fix the CCH in place with the fins pointed upward in order to reduce the rod support pitch. Pointing the fins upwards also gives the installation a tidier appearance.
When there is a withdrawal, the spiral sections of the CCH interfere with the metal fittings, and the fins do not point upwards. What should we do in this case?
When the fins do not point upwards, slightly displacing the metal fittings will free up the spiral sections of the CCH, and the fins can be easily pointed upwards. Even if this is not possible, and the fins point to the side or down, the rod will not fly off in a strong wind.
Is there any method of installing CCH over a long span (60−70m)?
CCH can be pushed out for around 50m. Because pushing CCH too far might cause them to deform, they should be pulled over long spans.
Are there occasions when cables become congested and the shuttle cannot pass through when cables are being added, and it is not possible to bundle the rated amount of cables?
Even if the cables become congested, because the added cable can be inserted from the side, there is no need for the shuttle to pass through, and the rated amount of cables can be bundled.
Do cables ever drop?
We have conducted cable dancing tests modeling strong winds, and verified that they caused no problems to cables. The system is reliable enough to resist strong typhoons (wind speed: 70m/s) in Okinawa and heavy snows in the Hokuriku region.
The bobbins are large and occupy a considerable area, and are inconvenient to carry around. Can they be made smaller?
The dimensions of the bobbins are set based on the bundling diameter for CCH. If the bundling diameter of the CCH was reduced, the bobbins could be made smaller, but this would markedly affect the ability to pay out the hangers and the ability to install the cable. We hope that our customers will understand that for these reasons, the present size of the bobbins is the correct size.
Can CCH be made a little more compact
In order to make CCH more compact, it would be necessary to reduce the pitch of the fins and reduce the bundling diameter. This would markedly affect the ability to pay out the hangers and the ability to install the cable. Given this, the present size or the CCH is the correct size.
Even if we use branch covers, we cannot intersect or send cables.
In this case, you can consider using a different direction of insertion into the hanger covers, or winding the cable into outdoor (rubber) hangers.
The greater the number of connections using connection units, the more the fins point in random directions.
Making connections in the appropriate positions (at the ends of sections that have white markings in three places) ensures that the connections are made at the same pitch as the integrated type, with the fins pointing upwards in a fixed direction.
There are a lot of ends left over when using CCH.
Ends can be reduced if connection units are used effectively. When linking up the CCH, connections cannot be made using right and left twists as is, and ends of around one meter in length will therefore be left over.
If there is a fin where the end clamp should be positioned, the hanger cannot be fixed.
CCH can be extended to a certain extent for fixing in place (as a yardstick, this is around 1% of the length of the span). When the position of the end clamp overlaps with the location of a fin, extend the CCH until the center of a spiral reaches the end clamp position, and fix the CCH in place.
We are concerned about the fact that the terminal section is open when installing metal multi-pair cable using CCH. What points should we be aware of?
When adjusting the slug (straightening cables) on the terminal section of a heavy metal multi-pair cable, there is a possibility that the cable will come loose from the inverted SZ section of the hanger into which the slug is inserted. In this case, prevent the cable pulley from coming off. Remove the cable pulley after adjustment of the slug. (When the slug has been adjusted, the installation will be stable).
The fins do not point upwards after the terminal section of the CCH has been fixed in place.
When fixing a CCH in place using an end clamp, the fins will naturally point upwards if the clamp is positioned close to the center of the three markings on the hanger or close to the center of a spiral section without markings (close to the central section between the fins). In this case, ensure that the hanger is installed parallel, without twisting in the direction of the span.
When paying out the CCH, the bobbin brake does not function effectively, and the CCH flies off the bobbin.
It is possible that the fixing jig in the bobbin has lost its back tension function. To ensure that this function is maintained over the long-term, store bobbins with the jigs removed when not in use. In the event that the back tension function has been lost, the additional brake pad should be used. (Sold separately)